The Growth of Arctic Marine Phytoplankton in Frobisher Bay
ABSTRACT. During the summers of 1977 and 1978, populations of phytoplankton collected in Frobisher Bay at depths of 0,5,10, 15,20 and 25 m were enclosed in dialysis bags and incubated in situ at the depths from which they were collected. The greatest growth rate of the populations occur-red at 10 m...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.489.9403 http://pubs.aina.ucalgary.ca/arctic/Arctic38-1-31.pdf |
| Summary: | ABSTRACT. During the summers of 1977 and 1978, populations of phytoplankton collected in Frobisher Bay at depths of 0,5,10, 15,20 and 25 m were enclosed in dialysis bags and incubated in situ at the depths from which they were collected. The greatest growth rate of the populations occur-red at 10 m in July-August 1977 and at 5 m in late Augustearly September 1978. Exponential growth rates and generation times of dominant species of phytoplankton are tabulated. Growth rates ranged from 0.06 to 1.12 divisionday ” and generation times varied from 21.4 to 404.7 hrdvision-I. Light appears to be the major limiting factor for phytoplankton growth in this area; nutrients, temperature and salinity were not limiting in this ex-periment. Key words: growth rates, generation times, arctic marine phytoplankton, limiting factors &UMk Au cours des kt & 1977 et 1978, des populations de phytoplancton eChantillo&s B Frobisher Bay B des profondeurs de 0,5,10,15,20 et 25 m ont 6te i n c u b in situ B I’inttrieur de sacs B dialyse aux profondeurs d’&hantillonnage ci-mentionneeS. Au mois de juillet et d’aofit respective-ment c’est B 10 m de profondeur qu’on a observt la meilleure croissance des populations et B 5 m au cours de la +ride allant de la fin d t, dtbut septembre. Les courbes de croissance, les taux de croissance exponentielle de m&me que les temps de gh5ration des especeS dominantes de phytoplancton sont pr6senteS. Les taux de croissance se sont BchelOnneS entre 0.06 et 1.12 division-jour ” tandis que les temps de gkdration ont varit de 21.4 B 404.7 hr-division”. L’ensoleillement semble &re le facteur limitant principal affectant la croissance du phytoplancton dans cette dgion; la teneur en tlkments nutritifs la tem+rature et la salinitt de l’eau n’ont pas t t t restrictifs dans cette experience. Mots clh: les tau de croissance. les temps de gtnkration, phytoplancton marine de l’arctique, des facteurs limitants |
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